XR2207 Exar Corporation, XR2207 Datasheet - Page 12

• Manufacturer Part Number: XR2207
• Description: Voltage-Controlled Oscillator
• Manufacturer: Exar Corporation

Single Supply Operation
The circuit should be interconnected as shown in
Figure 14A or Figure 14B for single supply operation. Pin
12 should be grounded, and pin 11 biased from V
through a resistive divider to a value of bias voltage
between V
through a 1 F capacitor.
XR-2207
Rev. 2.02
+
/3 and V
+
/2. Pin 10 is bypassed to ground
Keying Inputs
CB = Bypass Cap
CB = Bypass Cap
CB
Figure 14. Single Supply Operation
10
8
9
CB
10
CB
9
8
CB
A
B
GND
A
B
GND
V+
V
B. Single Frequency
V+
V
CC
R1
1
R 1
CC
A. General Case
1
R 1
C1
4
XR-2207
R2
R 2
C1
XR-2207
4
2
2
R 2
R3
5
CC
C
R3
R 3
5
C
R 3
6
12
C2
6
R 4
R4
For single supply operation, the DC voltage at pin 10 and
the timing terminals (pins 4 through 7) are equal and
approximately 0.6V above V
The logic levels at the binary keying terminals are
referenced to the voltage at pin 10.
3
C2
R 4
7
SWO
TWO
BIAS
3
7
V-
SWO
TWO
BIAS
1 2
V-
1 2
13
14
11
13
14
11
V
CC
V
3.9K
3.9K
CC
RL
5.1K
5.1K
RL
Square Wave
Triangle Wave
Square Wave
Triangle Wave
f=1/R3 C
Output
Output
Output
Output
V
CC
V
B
CC
, the bias voltage at pin 11.